The reason you do not see the 64/65/68 high compresion hemis in those classes is because they were not designated street cars. They were perpose built super stock cars. Yes some states you could get them titled back in the day. Today it is easier to plate them ( eg Steve Atwels ss car in drag week).Production numbers are higher than the copo cars but the copo cars where not super stock purpose cars. They came with titles and warrenty. When you look at how these cars were equiped back then they all had some great stuff to make the hp-weight very good and very competetive. So really it boils down to engine builders to maximise that combo. So looking at that it should be very competive between gm copo cars,chrysler hemi cars, ford 427hi rise cars. So I say let the racing begin and may the best engine builders show their stuff. Jake